Bullet train project: Bids invited for 21-km tunnel connecting two cities | Mumbai news

In a major boost to the high-speed rail project, the National High Speed ​​Rail Corporation Limited (NHSRCL) has launched a tender for the construction of a 21 km tunnel that will link Mumbai with Ahmedabad. This includes a seven km long underwater tunnel across the Thane Stream between Shilphata in Kalyan and the Bandra Kurla Complex (BKC).

The deadline for submitting offers is January 19, 2023.

The underwater tunnel, a first in the country, will be built using a tunnel boring machine (TBM) and the new Austrian tunneling method (NATM). It will be a single-tube tunnel to accommodate twin tracks for uphill and downhill trains. As part of the tender dossier, 39 equipment rooms at 37 locations will also be built along the tunnel.

“The 21 km tunnel will be approximately 25 to 65 meters deep and the deepest point will be 114 meters below Parsik Hill near Shilphata. Special tunnel boring machines with a cutting head width of 13.1 meters will be used for this project. After preparing a 16 km section with three tunnel boring machines, NATM will be used for the remaining five km. As the end between Ghansoli and Shilphata is tilted, it will take NATM,” an NHSRCL official said.

The tunnel starts at Shilphata, passes through Ghansoli and crosses the Thane Creek, then enters Vikhroli before ending at BKC.

This project was supposed to be completed by 2023, but due to obstacles in land acquisition and the Covid-19 pandemic, it has been delayed.

The entire Ahmedabad-Mumbai route will have 12 stations – eight in Gujarat and four in Maharashtra. The stations in Gujarat are Vapi, Bilimora, Surat, Bharuch, Vadodara, Anand, Ahmedabad and Sabarmati while those in Maharashtra are BKC, Thane, Virar and Boisar.

In 2019, NHSRCL first launched a tender but did not attract any bidders. It launched tenders again in November 2021 for the digging works of the underground tunnel, but these were canceled for administrative reasons.

In July this year, tenders for the design and construction of the BKC underground station were launched. The deadline for the offer is October 20.

The project was sanctioned in December 2015 for an estimated cost of $10.8 billion.

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